Like me....he has a high sex drive. I rarely go a day without masturbating at least twice, and hopefully have sex with my wife or someone else a couple times....and I am 53
It sounds to me like he is male and you are female lol
There are three types of couples
A) two people with high libido, two people with moderate, two people with low interest in sex, two people that are A sexual
B) two people that comprise because they are different but still want to be together
C) two people that are too different and unable to compromise a win win and both usually go unhappy, unfulfilled and unsatisfied
You get to pick which one you are A B or C,
Right now it sounds like you are C, start with a compromise, before you break up to find a boyfriend with a lower libido,
my ex husband used to love it when I would just gently hold his testicles when snuggling, you could try that, you would get to cuddle and just hold him while you fall asleep and he wouldn't need to pull away to masterbate because he could easily do it while you hold him, or try as others mentioned, either a compromise of one night a week only sex no cuddling and one night a week no sex but definitely cuddling the other days could be both or neither,
or it is very common now to have an open marriage, you could allow him to have a second partner to have sex with only once a week in exchange that the other 6 days a week he cuddle with you and that he can masterbate whenever but sex will always be initiated by you or any other compromise you two can come up with, there are thousands of possibilities,
I have been with my current husband for five years and have only said no to sex twice so I am afraid I don't personally share your issue regarding too much sex but it is very important for a couple to have intamacy, even A sexual or extremely low libido couples have intamacy and don't forget intamacy can also be talking and listening about things you would never tell I anyone else, so maybe tell him you will talk dirty to him while he masterbates IF he is willing to cuddle you for a long period before and after or for a long time during another part of the day, ie days off just sit for half an hour holding hands in middle of afternoon inside or outside or try having sex mid morning and then at bed time only cuddle and fall asleep
There is nothing wrong with a guy that wants TONS of sex. Just let him know in no uncertain terms that you also want to make love. My husband and I have sex 4-5 times a day but sometimes I just want him to hold me and love on me. When I say that's what I want then all the toys, cuffs, ropes, etc get put away and I get exactly what I want, even if it is just holding me til I fall asleep. Communication and compromise on both parts is the key.